UNW_INIT_REMOTE(3) Programming Library UNW_INIT_REMOTE(3)
NAME
unw_init_remote -- initialize cursor for remote unwinding
SYNOPSIS
#include <libunwind.h>
int unw_init_remote(unw_cursor_t *c, unw_addr_space_t as, void *arg);
DESCRIPTION
The unw_init_remote() routine initializes the unwind cursor pointed to
by c for unwinding in the address space identified by as. The as argu-
ment can either be set to unw_local_addr_space (local address space) or
to an arbitrary address space created with unw_create_addr_space().
The arg void-pointer tells the address space exactly what entity should
be unwound. For example, if unw_local_addr_space is passed in as, then
arg needs to be a pointer to a context structure containing the ma-
chine-state of the initial stack frame. However, other address-spaces
may instead expect a process-id, a thread-id, or a pointer to an arbi-
trary structure which identifies the stack-frame chain to be unwound.
In other words, the interpretation of arg is entirely dependent on the
address-space in use; libunwind never interprets the argument in any
way on its own.
Note that unw_init_remote() can be used to initiate unwinding in any
process, including the local process in which the unwinder itself is
running. However, for local unwinding, it is generally preferable to
use unw_init_local() instead, because it is easier to use and because
it may perform better.
RETURN VALUE
On successful completion, unw_init_remote() returns 0. Otherwise the
negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETY
unw_init_remote() is thread-safe. If the local address-space is passed
in argument as, this routine is also safe to use from a signal handler.
ERRORS
UNW_EINVAL
unw_init_remote() was called in a version of libunwind which
supports local unwinding only (this normally happens when defin-
ing UNW_LOCAL_ONLY before including <libunwind.h> and then call-
ing unw_init_remote()).
UNW_EUNSPEC
An unspecified error occurred.
UNW_EBADREG
A register needed by unw_init_remote() wasn't accessible.
SEE ALSO
libunwind(3), unw_create_addr_space(3), unw_init_local(3)
AUTHOR
David Mosberger-Tang
Email: dmosberger@gmail.com
WWW: http://www.nongnu.org/libunwind/.
Programming Library 16 August 2007 UNW_INIT_REMOTE(3)
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